Message-ID: <CAAhV-H7nhkvLoDMwQDwNEhykZANGMq-Qrzip48qYzgQs1fNUgA@mail.gmail.com>
Date:   Mon, 6 Nov 2023 10:15:38 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Jaak Ristioja <jaak@...tioja.ee>
Cc:     Evan Preston <x.arch@...eston.net>,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Linux DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Bagas Sanjaya <bagasdotme@...il.com>
Subject: Re: Blank screen on boot of Linux 6.5 and later on Lenovo ThinkPad L570

Hi, Jaak and Evan,

On Mon, Nov 6, 2023 at 12:28 AM Jaak Ristioja <jaak@...tioja.ee> wrote:
>
> On 05.11.23 14:40, Huacai Chen wrote:
> > Hi, Evan,
> >
> > On Sat, Nov 4, 2023 at 10:50 AM Evan Preston <x.arch@...eston.net> wrote:
> >>
> >> Hi Huacai,
> >>
> >> On 2023-11-03 Fri 02:36pm, Huacai Chen wrote:
> >>> Hi, Evan,
> >>>
> >>> On Fri, Nov 3, 2023 at 1:54 PM Evan Preston <x.arch@...eston.net> wrote:
> >>>>
> >>>> Hi Huacai,
> >>>>
> >>>> On 2023-11-02 Thu 08:38pm, Huacai Chen wrote:
> >>>>> Hi, Jaak,
> >>>>>
> >>>>> On Wed, Nov 1, 2023 at 7:52 PM Jaak Ristioja <jaak@...tioja.ee> wrote:
> >>>>>>
> >>>>>> On 31.10.23 14:17, Huacai Chen wrote:
> >>>>>>> Hi, Jaak and Evan,
> >>>>>>>
> >>>>>>> On Sun, Oct 29, 2023 at 9:42 AM Huacai Chen <chenhuacai@...nel.org> wrote:
> >>>>>>>>
> >>>>>>>> On Sat, Oct 28, 2023 at 7:06 PM Jaak Ristioja <jaak@...tioja.ee> wrote:
> >>>>>>>>>
> >>>>>>>>> On 26.10.23 03:58, Huacai Chen wrote:
> >>>>>>>>>> Hi, Jaak,
> >>>>>>>>>>
> >>>>>>>>>> On Thu, Oct 26, 2023 at 2:49 AM Jaak Ristioja <jaak@...tioja.ee> wrote:
> >>>>>>>>>>>
> >>>>>>>>>>> On 25.10.23 16:23, Huacai Chen wrote:
> >>>>>>>>>>>> On Wed, Oct 25, 2023 at 6:08 PM Thorsten Leemhuis
> >>>>>>>>>>>> <regressions@...mhuis.info> wrote:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Javier, Dave, Sima,
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> On 23.10.23 00:54, Evan Preston wrote:
> >>>>>>>>>>>>>> On 2023-10-20 Fri 05:48pm, Huacai Chen wrote:
> >>>>>>>>>>>>>>> On Fri, Oct 20, 2023 at 5:35 PM Linux regression tracking (Thorsten
> >>>>>>>>>>>>>>> Leemhuis) <regressions@...mhuis.info> wrote:
> >>>>>>>>>>>>>>>> On 09.10.23 10:54, Huacai Chen wrote:
> >>>>>>>>>>>>>>>>> On Mon, Oct 9, 2023 at 4:45 PM Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >>>>>>>>>>>>>>>>>> On Mon, Oct 09, 2023 at 09:27:02AM +0800, Huacai Chen wrote:
> >>>>>>>>>>>>>>>>>>> On Tue, Sep 26, 2023 at 10:31 PM Huacai Chen <chenhuacai@...nel.org> wrote:
> >>>>>>>>>>>>>>>>>>>> On Tue, Sep 26, 2023 at 7:15 PM Linux regression tracking (Thorsten
> >>>>>>>>>>>>>>>>>>>> Leemhuis) <regressions@...mhuis.info> wrote:
> >>>>>>>>>>>>>>>>>>>>> On 13.09.23 14:02, Jaak Ristioja wrote:
> >>>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>>> Upgrading to Linux 6.5 on a Lenovo ThinkPad L570 (Integrated Intel HD
> >>>>>>>>>>>>>>>>>>>>>> Graphics 620 (rev 02), Intel(R) Core(TM) i7-7500U) results in a blank
> >>>>>>>>>>>>>>>>>>>>>> screen after boot until the display manager starts... if it does start
> >>>>>>>>>>>>>>>>>>>>>> at all. Using the nomodeset kernel parameter seems to be a workaround.
> >>>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>>> I've bisected this to commit 60aebc9559492cea6a9625f514a8041717e3a2e4
> >>>>>>>>>>>>>>>>>>>>>> ("drivers/firmware: Move sysfb_init() from device_initcall to
> >>>>>>>>>>>>>>>>>>>>>> subsys_initcall_sync").
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>> As confirmed by Jaak, disabling DRM_SIMPLEDRM makes things work fine
> >>>>>>>>>>>>>>>>>>> again. So I guess the reason:
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Well, this to me still looks a lot (please correct me if I'm wrong) like
> >>>>>>>>>>>>>>>> regression that should be fixed, as DRM_SIMPLEDRM was enabled beforehand
> >>>>>>>>>>>>>>>> if I understood things correctly. Or is there a proper fix for this
> >>>>>>>>>>>>>>>> already in the works and I just missed this? Or is there some good
> >>>>>>>>>>>>>>>> reason why this won't/can't be fixed?
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> DRM_SIMPLEDRM was enabled but it didn't work at all because there was
> >>>>>>>>>>>>>>> no corresponding platform device. Now DRM_SIMPLEDRM works but it has a
> >>>>>>>>>>>>>>> blank screen. Of course it is valuable to investigate further about
> >>>>>>>>>>>>>>> DRM_SIMPLEDRM on Jaak's machine, but that needs Jaak's effort because
> >>>>>>>>>>>>>>> I don't have a same machine.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Side note: Huacai, have you tried working with Jaak to get down to the
> >>>>>>>>>>>>> real problem? Evan, might you be able to help out here?
> >>>>>>>>>>>> No, Jaak has no response after he 'fixed' his problem by disabling SIMPLEDRM.
> >>>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> I'm sorry, what was it exactly you want me to do? Please be mindful that
> >>>>>>>>>>> I'm not familiar with the internals of the Linux kernel and DRI, and it
> >>>>>>>>>>> might sometimes take weeks before I have time to work and respond on this.
> >>>>>>>>>> It doesn't matter. I hope you can do some experiments to investigate
> >>>>>>>>>> deeper. The first experiment you can do is enabling SIMPLEFB (i.e.
> >>>>>>>>>> CONFIG_FB_SIMPLE) instead of SIMPLEDRM (CONFIG_DRM_SIMPLEDRM) to see
> >>>>>>>>>> whether there is also a blank screen. If no blank screen, that
> >>>>>>>>>> probably means SIMPLEDRM has a bug, if still blank screen, that means
> >>>>>>>>>> the firmware may pass wrong screen information.
> >>>>>>>>>
> >>>>>>>>> Testing with 6.5.9 I get a blank screen with CONFIG_DRM_SIMPLEDRM=y and
> >>>>>>>>> get no blank screen with CONFIG_FB_SIMPLE=y and CONFIG_DRM_SIMPLEDRM unset.
> >>>>>>>> CONFIG_FB_SIMPLE and  CONFIG_DRM_SIMPLEDRM use the same device created
> >>>>>>>> by sysfb_init(). Since FB_SIMPLE works fine, I think the real problem
> >>>>>>>> is that DRM_SIMPLEDRM has a bug. The next step is to enable
> >>>>>>>> CONFIG_DRM_SIMPLEDRM and trace its initialization. In detail, adding
> >>>>>>>> some printk() in simpledrm_probe() and its sub-routines to see where
> >>>>>>>> the driver fails. The output of these printk() can be seen by the
> >>>>>>>> 'dmesg' command after boot.
> >>>>>>> I need your help. I tried with my laptop (ThinkPad E490, Intel Core
> >>>>>>> i3-8145U, UHD Graphics 620) but I can't reproduce your problem. So
> >>>>>>> please patch your 6.5.x kernel with this temporary patch [1], then
> >>>>>>> build a "bad kernel" with SIMPLEDRM enabled. And after booting your
> >>>>>>> machine with this "bad kernel", please give me the dmesg output. Thank
> >>>>>>> you very much.
> >>>>>>>
> >>>>>>> [1] http://ddns.miaomiaomiao.top:9000/download/kernel/patch-6.5.9
> >>>>>>
> >>>>>> I'm unable to download it. Can you please send it by e-mail?
> >>>>> I'm sorry, please download from attachment.
> >>>>
> >>>> When applying this patch the first hunk (drivers/firmware/sysfb.c) fails for
> >>>> me with 6.5.9.  Attempting to load the 6.5.9 kernel without this patch
> >>>> produces no dmesg output on my machine.
> >>> You copy-paste the patch? If you download it directly it can be
> >>> applied successfully, I think.
> >>
> >> The patch downloaded from your URL applies successfully.  However, I still
> >> see no dmesg output using the patched 6.5.9 kernel.  'journalctl -k -b all'
> >> shows no dmesg output from any 6.5.x boots, only from 6.4.12 boots.
> > Thank you for your testing. Since you cannot boot to GUI successfully
> > as Jaak, you may have some troubles with getting the dmesg output. But
> > you can try to use "systemd.unit=multi-user.target" boot parameters.
> > In this way you may boot to the login: prompt and then you can get
> > dmesg output. Or if you still fail, you may use 'jornalctl -k -b -1'
> > to get the previous dmesg output with 6.4.12.
> >
> > Hi, Jaak,
> >
> > Have you tested? I think you can successfully get a dmesg output with my patch.
>
> Yes, just tested it, here I think are the relevant parts from a dmesg
> produced with CONFIG_DRM_SIMPLEDRM and the patch provided by Huacai:
>
> ...
> [    2.909625] sysfb 1
> [    2.909627] sysfb 2
> ...
> [    2.951477] ACPI: bus type drm_connector registered
> [    2.952096] i915 0000:00:02.0: [drm] VT-d active for gfx access
> [    2.952105] resource: resource sanity check: requesting [mem
> 0x00000000e0000000-0x00000000efffffff], which spans more than BOOTFB
> [mem 0xe0000000-0xe012bfff]
> [    2.952111] caller i915_ggtt_init_hw+0x88/0x120 mapping multiple BARs
> [    2.952138] i915 0000:00:02.0: [drm] Using Transparent Hugepages
> [    2.953204] Loading firmware: i915/kbl_dmc_ver1_04.bin
> [    2.953485] i915 0000:00:02.0: [drm] Finished loading DMC firmware
> i915/kbl_dmc_ver1_04.bin (v1.4)
> ...
> [    4.142075] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on
> minor 0
> [    4.144269] ACPI: video: Video Device [GFX0] (multi-head: yes  rom:
> no  post: no)
> [    4.144414] input: Video Bus as
> /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input4
> [    4.144580] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 1
> [    4.144590] usbcore: registered new interface driver udl
> [    4.144603] T: probe 1
> [    4.144605] T: create 1
> [    4.144610] T: create 2
> [    4.144611] T: create 3a-1
> [    4.144613] T: create 3a-2
> [    4.144614] T: create 3a-3
> [    4.144616] T: create 3a-4
> [    4.144618] T: create 4
> [    4.144619] T: create 5
> [    4.144621] simple-framebuffer simple-framebuffer.0: [drm] display
> mode={"": 60 18432 640 640 640 640 480 480 480 480 0x40 0x0}
> [    4.144628] simple-framebuffer simple-framebuffer.0: [drm]
> framebuffer format=XR24 little-endian (0x34325258), size=640x480,
> stride=2560 byte
> [    4.144633] T: create 6b-1
> [    4.144635] T: create 6b-2
> [    4.144637] simple-framebuffer simple-framebuffer.0: [drm] using I/O
> memory framebuffer at [mem 0xe0000000-0xe012bfff flags 0x200]
> [    4.144643] T: create 6b-3
> [    4.144660] T: create 6b-4
> [    4.144662] T: create 7
> [    4.144673] T: create 8
> [    4.144676] T: create 9
> [    4.144678] T: create 10
> [    4.144681] T: create 11
> [    4.144685] T: create 12
> [    4.144689] T: probe 2
> [    4.144728] [drm] Initialized simpledrm 1.0.0 20200625 for
> simple-framebuffer.0 on minor 2
> [    4.144732] T: probe 3
> [    4.145905] Console: switching to colour frame buffer device 80x30
> [    4.150437] simple-framebuffer simple-framebuffer.0: [drm] fb0:
> simpledrmdrmfb frame buffer device
> [    4.150766] T: probe 4
> [    4.151218] loop: module loaded
> [    4.154434] i915 0000:00:02.0: [drm] fb1: i915drmfb frame buffer device
> ...
> [   44.630789] simple-framebuffer simple-framebuffer.0: swiotlb buffer
> is full (sz: 1310720 bytes), total 32768 (slots), used 0 (slots)
> ...
>
> The last message might be due to the display manager starting up.
>
> Hope it helps.
Thank you for your testing. Jaak's problem seems related to the
initialization order, you can try to modify drivers/gpu/drm/Makefile,
move

obj-y                  += tiny/

to between these two lines

obj-$(CONFIG_DRM_SCHED) += scheduler/
obj-$(CONFIG_DRM_RADEON)+= radeon/

then build a new 6.5.x kernel to see whether your problem is resolved.

Evan's problem seems a little strange, could you please give me your
config files of both 6.4.12 and 6.5.x? And you can also try the above
method to see if anything changes.

Huacai

>
> J
>
> >
> >>
> >> Evan
> >>
> >>>
> >>> Huacai
> >>>
> >>>>
> >>>> Evan
> >>>>
> >>>>>
> >>>>> Huacai
> >>>>>
> >>>>>>
> >>>>>> Jaak
> >>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> Huacai
> >>>>>>>
> >>>>>>>>
> >>>>>>>> Huacai
> >>>>>>>>
> >>>>>>>>>
> >>>>>>>>> Jaak
> >>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> Huacai
> >>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> Jaak
> >>>>>>>>>>>
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> But I write this mail for a different reason:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>> I am having the same issue on a Lenovo Thinkpad P70 (Intel
> >>>>>>>>>>>>>> Corporation HD Graphics 530 (rev 06), Intel(R) Core(TM) i7-6700HQ).
> >>>>>>>>>>>>>> Upgrading from Linux 6.4.12 to 6.5 and later results in only a blank
> >>>>>>>>>>>>>> screen after boot and a rapidly flashing device-access-status
> >>>>>>>>>>>>>> indicator.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> This additional report makes me wonder if we should revert the culprit
> >>>>>>>>>>>>> (60aebc9559492c ("drivers/firmware: Move sysfb_init() from
> >>>>>>>>>>>>> device_initcall to subsys_initcall_sync") [v6.5-rc1]). But I guess that
> >>>>>>>>>>>>> might lead to regressions for some users? But the patch description says
> >>>>>>>>>>>>> that this is not a common configuration, so can we maybe get away with that?
> >>>>>>>>>>>>     From my point of view, this is not a regression, 60aebc9559492c
> >>>>>>>>>>>> doesn't cause a problem, but exposes a problem. So we need to fix the
> >>>>>>>>>>>> real problem (SIMPLEDRM has a blank screen on some conditions). This
> >>>>>>>>>>>> needs Jaak or Evan's help.
> >>>>>>>>>>>>
> >>>>>>>>>>>> Huacai
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> >>>>>>>>>>>>> --
> >>>>>>>>>>>>> Everything you wanna know about Linux kernel regression tracking:
> >>>>>>>>>>>>> https://linux-regtracking.leemhuis.info/about/#tldr
> >>>>>>>>>>>>> If I did something stupid, please tell me, as explained on that page.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>> When SIMPLEDRM takes over the framebuffer, the screen is blank (don't
> >>>>>>>>>>>>>>>>>>> know why). And before 60aebc9559492cea6a9625f ("drivers/firmware: Move
> >>>>>>>>>>>>>>>>>>> sysfb_init() from device_initcall to subsys_initcall_sync") there is
> >>>>>>>>>>>>>>>>>>> no platform device created for SIMPLEDRM at early stage, so it seems
> >>>>>>>>>>>>>>>>>>> also "no problem".
> >>>>>>>>>>>>>>>>>> I don't understand above. You mean that after that commit the platform
> >>>>>>>>>>>>>>>>>> device is also none, right?
> >>>>>>>>>>>>>>>>> No. The SIMPLEDRM driver needs a platform device to work, and that
> >>>>>>>>>>>>>>>>> commit makes the platform device created earlier. So, before that
> >>>>>>>>>>>>>>>>> commit, SIMPLEDRM doesn't work, but the screen isn't blank; after that
> >>>>>>>>>>>>>>>>> commit, SIMPLEDRM works, but the screen is blank.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Huacai
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> Confused...
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> --
> >>>>>>>>>>>>>>>>>> An old man doll... just what I always wanted! - Clara
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>
> >>>>>>
> >>>>
> >>>>
>

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