linux-kernel - [Regression/Oops] nsc-ircc: 4.3.0rc6/rc7 No backlight on Thinkpad T60P

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Date:	Tue, 27 Oct 2015 09:07:57 -0600
From:	"Simon Wood" <simon@...gewell.org>
To:	linux-kernel@...r.kernel.org
Cc:	"Samuel Ortiz" <samuel@...tiz.org>, netdev@...r.kernel.org,
	simon@...gewell.org
Subject: [Regression/Oops] nsc-ircc: 4.3.0rc6/rc7 No backlight on Thinkpad
 T60P

Tried the latest kernel and have the issue where the LCD backlight does
not light (ie dark screen) after the kernel has booted.

It appears that there is a 'oops' with the nsc-ircc driver, and I assume
that this is the root of the problem. 4.3.0rc6 and rc7 are bad, rc2 seems
OK.

--
Oct 23 07:35:08 retrobox kernel: [   23.640044] nsc-ircc, driver loaded
(Dag Brattli)
Oct 23 07:35:08 retrobox kernel: [   23.640730] BUG: unable to handle
kernel NULL pointer dereference at 00000130
Oct 23 07:35:08 retrobox kernel: [   23.641422] IP: [<c1017802>]
arch_dma_alloc_attrs+0x12/0x70
Oct 23 07:35:08 retrobox kernel: [   23.641953] *pdpt = 00000000363cb001
*pde = 0000000000000000
Oct 23 07:35:08 retrobox kernel: [   23.642517] Oops: 0000 [#1] SMP
Oct 23 07:35:08 retrobox kernel: [   23.642849] Modules linked in:
nsc_ircc(+) snd_seq_device snd_timer snd floppy(+) irda soundcore
crc_ccitt shpchp 8250_fintek video mac_hid parport_pc ppdev lp parport
autofs4 e1000e psmouse ptp pata_acpi pps_core
Oct 23 07:35:08 retrobox kernel: [   23.644011] CPU: 0 PID: 267 Comm:
systemd-udevd Not tainted 4.3.0-rc6-g920+ #10
Oct 23 07:35:08 retrobox kernel: [   23.644011] Hardware name: LENOVO
2008VPX/2008VPX, BIOS 79ETE5WW (2.25 ) 08/27/2009
Oct 23 07:35:08 retrobox kernel: [   23.644011] task: f37c71c0 ti:
f63cc000 task.ti: f63cc000
Oct 23 07:35:08 retrobox kernel: [   23.644011] EIP: 0060:[<c1017802>]
EFLAGS: 00010202 CPU: 0
Oct 23 07:35:08 retrobox kernel: [   23.644011] EIP is at
arch_dma_alloc_attrs+0x12/0x70
Oct 23 07:35:08 retrobox kernel: [   23.644011] EAX: f63cdd08 EBX:
00000000 ECX: 000080d0 EDX: f63cdd0c
Oct 23 07:35:08 retrobox kernel: [   23.644011] ESI: f6afe66c EDI:
c1a305c0 EBP: f63cdd00 ESP: f63cdcfc
Oct 23 07:35:08 retrobox kernel: [   23.644011]  DS: 007b ES: 007b FS:
00d8 GS: 00e0 SS: 0068
Oct 23 07:35:08 retrobox kernel: [   23.644011] CR0: 80050033 CR2:
00000130 CR3: 36945200 CR4: 000006f0
Oct 23 07:35:08 retrobox kernel: [   23.644011] Stack:
Oct 23 07:35:08 retrobox kernel: [   23.644011]  00003830 f63cdd20
f8532a11 00000000 000080d0 f63cdd68 f6afe000 f6afe500
Oct 23 07:35:08 retrobox kernel: [   23.644011]  f6afe598 f63cdd68
f85371c9 c19ce2e2 f85340bc 00000000 f63cddc8 f63cdd58
Oct 23 07:35:08 retrobox kernel: [   23.644011]  c10b9be1 00000000
00000006 00000000 00000000 f8533267 f63cdd6c f63cdd60
Oct 23 07:35:08 retrobox kernel: [   23.644011] Call Trace:
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f8532a11>]
dma_alloc_attrs.constprop.18+0x4b/0x71 [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f85371c9>]
nsc_ircc_open+0x1c9/0x42c [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<c10b9be1>] ?
vprintk_default+0x41/0x60
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f85375e4>]
nsc_ircc_init+0x1b8/0xbd4 [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<c1002136>]
do_one_initcall+0xc6/0x200
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f853742c>] ?
nsc_ircc_open+0x42c/0x42c [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f853742c>] ?
nsc_ircc_open+0x42c/0x42c [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<c1002136>] ?
do_one_initcall+0xc6/0x200
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<f853742c>] ?
nsc_ircc_open+0x42c/0x42c [nsc_ircc]
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<c171d8db>] ?
preempt_schedule_common+0x1b/0x40
Oct 23 07:35:08 retrobox kernel: [   23.644011]  [<c171d925>] ?
_cond_resched+0x25/0x30
--

Cheers,
Simon.
View attachment "thinkpad-t60p-no-lcd-backlight.txt" of type "text/plain" (8773 bytes)