linux-kernel - Re: [REGRESSION] Re: AMDGPU 6.11.0 crash, 6.10.0 git bisect log

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Message-ID: <96393a13-20c2-434a-9d3d-41c083958732@amd.com>
Date: Sat, 21 Sep 2024 11:53:07 -0600
From: Alex Hung <alex.hung@....com>
To: Bob Gill <gillb5@...us.net>, "Dr. David Alan Gilbert"
 <linux@...blig.org>, alexander.deucher@....com
Cc: linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [REGRESSION] Re: AMDGPU 6.11.0 crash, 6.10.0 git bisect log

There is a fix in amd-staging-drm-next:

3e54e61e5636 drm/amd/display: only trigger BIOS related assert for older 
ASICs

--- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
@@ -227,7 +227,7 @@ static void init_transmitter_control(struct 
bios_parser *bp)
         uint8_t frev;
         uint8_t crev = 0;

-       if (!BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev))
+       if (!BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev) 
&& (bp->base.ctx->dc->ctx->dce_version <= DCN_VERSION_2_0))


It should land in 6.12. See 
https://lore.kernel.org/dri-devel/20240906211008.3072097-1-alexander.deucher@amd.com/T/


On 9/20/24 21:51, Bob Gill wrote:
> So the final change:
> 
> CONFIG_DEBUG_KERNEL_DC=y
> 
> (about line 227) of drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> 
> BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev);
> 
> with the 6.11.0 kernel,
> 
> and the X server is working OK.
> 
> Thanks,
> 
> Bob
> 
> On 2024-09-20 20:20, Alex Hung wrote:
>>
>>
>> On 2024-09-20 18:20, Bob Gill wrote:
>>> Hi.  Sorry for the late reply.  My config has
>>> CONFIG_DEBUG_KERNEL_DC=y
>>>
>>> I will set it to # CONFIG_DEBUG_KERNEL_DC is not set
>>
>> Hi Bob,
>>
>> It seems the below change in a171cce57792 causes the hang when 
>> CONFIG_DEBUG_KERNEL_DC is set.
>>
>> --- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
>> +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
>> @@ -227,7 +227,8 @@ static void init_transmitter_control(struct 
>> bios_parser *bp)
>>         uint8_t frev;
>>         uint8_t crev = 0;
>>
>> -       BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev);
>> +       if (!BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev))
>> +               BREAK_TO_DEBUGGER();
>>
>> If you can help confirm thefollowing fix the hang, I will prepare a 
>> revert patch next week:
>>
>> * Set CONFIG_DEBUG_KERNEL_DC and revert the above change, i.e.
>>
>> --- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
>> +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
>> @@ -227,8 +227,7 @@ static void init_transmitter_control(struct 
>> bios_parser *bp)
>>         uint8_t frev;
>>         uint8_t crev = 0;
>>
>> -       if (!BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev))
>> -               BREAK_TO_DEBUGGER();
>> +       BIOS_CMD_TABLE_REVISION(dig1transmittercontrol, frev, crev);
>>
>>
>> Thanks a lot
>>
>>>
>>> also,
>>>
>>> cat /var/log/kern.log | grep VBIOS       gives
>>>
>>> Sep 15 11:53:43 freedom kernel: [   16.372684] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 15 13:58:04 freedom kernel: [   16.705182] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 15 14:20:05 freedom kernel: [   17.043288] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 15 14:38:23 freedom kernel: [   16.625105] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 09:40:52 freedom kernel: [   16.780135] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 09:52:39 freedom kernel: [   15.764412] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 14:59:23 freedom kernel: [   16.077181] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 19:03:50 freedom kernel: [   16.613359] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 19:18:13 freedom kernel: [   15.895630] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 16 22:01:53 freedom kernel: [   15.768717] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 17 09:48:50 freedom kernel: [   15.758361] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 17 10:31:23 freedom kernel: [   15.762467] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 18 09:43:12 freedom kernel: [   16.086531] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 09:32:07 freedom kernel: [   16.034418] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 12:04:46 freedom kernel: [   15.771447] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 13:54:41 freedom kernel: [   15.791940] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 15:37:35 freedom kernel: [   15.749058] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 17:25:04 freedom kernel: [   16.449671] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 19:43:06 freedom kernel: [   16.312367] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 19 21:31:28 freedom kernel: [   15.864131] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 09:12:39 freedom kernel: [   15.764786] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 11:31:36 freedom kernel: [   17.332211] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 13:23:19 freedom kernel: [   15.759616] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 13:45:07 freedom kernel: [   16.557215] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 14:01:17 freedom kernel: [   16.433437] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 14:24:14 freedom kernel: [   15.770057] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 14:47:27 freedom kernel: [   15.725150] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 15:02:31 freedom kernel: [   16.591276] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>> Sep 20 15:19:44 freedom kernel: [   15.863542] amdgpu 0000:04:00.0: 
>>> amdgpu: Fetched VBIOS from ROM BAR
>>>
>>> so not what quite what you were looking for, but when I run cat 
>>> kern.log | grep Failed :
>>>
>>> Sep 15 11:53:43 freedom kernel: [   25.730013] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 15 13:58:04 freedom kernel: [   26.025432] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 15 14:38:23 freedom kernel: [   25.883820] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 16 09:40:52 freedom kernel: [   27.204539] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 16 14:41:22 freedom kernel: [   28.985885] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 16 19:03:50 freedom kernel: [   26.510748] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 17 09:48:50 freedom kernel: [   25.682372] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 17 10:31:23 freedom kernel: [   25.547899] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 18 09:43:12 freedom kernel: [   26.243232] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 19 09:32:07 freedom kernel: [   25.267332] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 19 12:04:46 freedom kernel: [   25.269450] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 19 15:37:35 freedom kernel: [   25.494803] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 19 19:43:06 freedom kernel: [   26.288598] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 20 09:12:39 freedom kernel: [   25.291743] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 20 13:23:19 freedom kernel: [   25.884358] uvcvideo 1-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 20 14:24:14 freedom kernel: [   25.312379] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 20 14:47:27 freedom kernel: [   25.352905] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>> Sep 20 15:19:44 freedom kernel: [   25.297893] uvcvideo 2-5.2:1.1: 
>>> Failed to set UVC probe control : -32 (exp. 26).
>>>
>>>
>>> Hopefully this helps.  Please mail me if you for more information.  I 
>>> have changed my .config and set
>>>
>>> # CONFIG_DEBUG_KERNEL_DC is not set
>>>
>>> I am attempting to build 6.11.0.
>>>
>>> Thanks,
>>>
>>> Bob
>>>
>>>
>>> On 2024-09-20 17:34, Alex Hung wrote:
>>>>
>>>>
>>>> On 2024-09-20 17:00, Dr. David Alan Gilbert wrote:
>>>>> * Bob Gill (gillb5@...us.net) wrote:
>>>>>> Hello.  Kernel 6.11.0 crashes. 6.10.0 builds.  Al Viro and Dr. 
>>>>>> David Alan
>>>>>> Gilbert have been helpful, and asked that I
>>>>>>
>>>>>> post a git bisect log.  The last log step seems odd, but the 
>>>>>> second last
>>>>>> step "Remove useless function call" might be what broke.
>>>>>
>>>>> Thank you for doing this!
>>>>>
>>>>> My reading is that's fine, I think the next one:
>>>>>
>>>>> tree: git bisect bad
>>>>> [a171cce57792b0a6206d532050179a381ad74f8f] drm/amd/display: Check 
>>>>> and log for
>>>>> function error codes
>>>>>
>>>>> or the one after it is the culprit?
>>>>>
>>>>> Adding the two Alex's from AMD back onto the thread.
>>>>> (Also added the [REGRESSION] marker the notes tell us to add)
>>>>
>>>> The commit triggers debugger in case of in case of errors.
>>>>
>>>> Is the config CONFIG_DEBUG_KERNEL_DC (Enable kgdb break in DC) 
>>>> enabled in .config, i.e. can you check "grep 
>>>> CONFIG_DEBUG_KERNEL_DC .config"?
>>>>
>>>> If so, can you also try to disable it and check whether you can see 
>>>> error messages "Failed to execute VBIOS command table" in kernel log?
>>>>
>>>>>
>>>>>> My hardware is old corei7 quad core/8 thread Tylersberg/Nehalem 
>>>>>> with an AMD
>>>>>> RX 6500XT.  That's the odd combination.
>>>>>>
>>>>>> Thanks in advance,
>>>>>
>>>>> Thanks again for the bisect.
>>>>>
>>>>> Dave
>>>>>
>>>>>> Bob
>>>>>>
>>>>>> Config:  (.config)
>>>>>> /data/kernel/bobtest6.10-64
>>>>>>
>>>>>> Build line: (last command tells me the job is finished)
>>>>>> make menuconfig && make -j $(nproc) && make modules && make 
>>>>>> modules_install
>>>>>> && make install && /data/music/pl.sh
>>>>>>
>>>>>> Rule 1: Do not modify ANYTHING in the source tree
>>>>>>
>>>>>> git bisect start
>>>>>> git bisect bad
>>>>>> git bisect good v6.10
>>>>>>
>>>>>> Bisecting: 11273 revisions left to test after this (roughly 14 steps)
>>>>>> [2c9b3512402ed192d1f43f4531fb5da947e72bd0] Merge tag 'for-linus' of
>>>>>> git://git.kernel.org/pub/scm/virt/kvm/kvm
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0+
>>>>>>
>>>>>> RESULT:  boot 6.10.0+ fails
>>>>>>           screen black for more than 2 minutes,
>>>>>>           (caps lock key unresponsive, reset, power
>>>>>>           buttons on computer case do nothing).  Reset with power 
>>>>>> bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 5677 revisions left to test after this (roughly 13 steps)
>>>>>> [280e36f0d5b997173d014c07484c03a7f7750668] nsfs: use cleanup guard
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0+
>>>>>>
>>>>>> RESULT: boot 6.10.0+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 2855 revisions left to test after this (roughly 12 steps)
>>>>>> [dde1a0e1625c08cf4f958348a83434b2ddecf449] Merge tag 'x86- 
>>>>>> percpu-2024-07-17'
>>>>>> of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0+
>>>>>>
>>>>>> RESULT: boot 6.10.0+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 1478 revisions left to test after this (roughly 11 steps)
>>>>>> [32a120f52a4c0121bca8f2328d4680d283693d60] drm/i915/mtl: Skip PLL 
>>>>>> state
>>>>>> verification in TBT mode
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 739 revisions left to test after this (roughly 10 steps)
>>>>>> [b6a343df46d69070a7073405e470e6348180ea34] drm/amdgpu: initialize 
>>>>>> GC IP
>>>>>> v11.5.2
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 369 revisions left to test after this (roughly 9 steps)
>>>>>> [cf1d06ac53a15b83c0a63225606cfe175e33a8a0] accel/ivpu: Increase 
>>>>>> autosuspend
>>>>>> delay to 100ms on 40xx
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc1+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc1+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 184 revisions left to test after this (roughly 8 steps)
>>>>>> [0ca9f757a0e27a076395ec1b2002661bcf5c25e8] drm/amd/pm: powerplay: Add
>>>>>> `__counted_by` attribute for flexible arrays
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.9.0-rc5+
>>>>>>
>>>>>> RESULT: boot 6.9.0-rc5+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 92 revisions left to test after this (roughly 7 steps)
>>>>>> [9862ef7bae47b9292a38a0a1b30bff7f56d7815b] drm/amd/display: Use 
>>>>>> periodic
>>>>>> detection for ipx/headless
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 44 revisions left to test after this (roughly 6 steps)
>>>>>> [a78313bb206e0c456a989f380c4cbd8af8af7c76] Merge tag
>>>>>> 'drm-intel-gt-next-2024-06-12' of
>>>>>> https://gitlab.freedesktop.org/drm/i915/kernel into drm-next
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 22 revisions left to test after this (roughly 5 steps)
>>>>>> [51dbe0239b1fc7c435867ce28e5eb4394b6641e1] drm/amd/display: Fix 
>>>>>> cursor size
>>>>>> issues
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ successful
>>>>>> tree: git bisect good
>>>>>> Bisecting: 11 revisions left to test after this (roughly 4 steps)
>>>>>> [871512e36f9c1c2cb4e62eb860ca0438800e4d63] drm/amd/display: Add 
>>>>>> workaround
>>>>>> to restrict max frac urgent for DPM0
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 5 revisions left to test after this (roughly 3 steps)
>>>>>> [5d93060d430b359e16e7c555c8f151ead1ac614b] drm/amd/display: Check 
>>>>>> HDCP
>>>>>> returned status
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> Bisecting: 2 revisions left to test after this (roughly 1 step)
>>>>>> [e094992bd1caa1fbd42221c7c305fc3b54172b5c] drm/amd/display: Remove 
>>>>>> useless
>>>>>> function call
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ successful
>>>>>>
>>>>>> tree: git bisect good
>>>>>> [2c2ee1d1329881d8e6bb23c3b9f3b41df8a8055c] drm/amd/display: Check 
>>>>>> and log
>>>>>> for function error codes
>>>>>>
>>>>>> latest kernel:
>>>>>> ls -alt /lib/modules | head -2 | tail -1 | tr -s " " | cut -d' ' -f9
>>>>>> 6.10.0-rc3+
>>>>>>
>>>>>> RESULT: boot 6.10.0-rc3+ fails
>>>>>>          screen black for more than 2 minutes,
>>>>>>          (caps lock key unresponsive, reset, power
>>>>>>          buttons on computer case do nothing).  Reset with power bar.
>>>>>>
>>>>>> tree: git bisect bad
>>>>>> [a171cce57792b0a6206d532050179a381ad74f8f] drm/amd/display: Check 
>>>>>> and log
>>>>>> for function error codes
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>