[Bug 49688] [GM965/GL960] blank screen after switching between VGA1 and LVDS1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49688

--- Comment #42 from max <manikulin at gmail.com> ---
3.12.0-994-generic #201311210459 SMP Thu Nov 21 10:09:54 UTC 2013 i686 i686
i686 GNU/Linux
(ubuntu mainline drm-intel-nightly)

[    3.917667] [drm] initialized overlay support
[    4.085004] fbcon: inteldrmfb (fb0) is primary device
[    4.108135] ------------[ cut here ]------------
[    4.108208] WARNING: CPU: 0 PID: 204 at
/home/apw/COD/linux/drivers/gpu/drm/i
915/intel_panel.c:792 intel_panel_enable_backlight+0xca/0xd0 [i915]()
[    4.108223] Modules linked in: hid_a4tech ahci(+) r8169 libahci i915(+)
usbhi
d mii i2c_algo_bit hid drm_kms_helper video drm
[    4.108229] CPU: 0 PID: 204 Comm: modprobe Not tainted 3.12.0-994-generic
#20
1311210459
[    4.108230] Hardware name: ASUSTeK Computer Inc.         F80L                
/F80L      , BIOS 206     08/06/2008
[    4.108240]  00000000 00000000 f5d6b884 c1675822 f8af35fc f5d6b8b4 c1056804
c
1876a24
[    4.108247]  00000000 000000cc f8af35fc 00000318 f8abefda f8abefda f5f29800
f
54f0000
[    4.108255]  f54f13dc f5d6b8c4 c1056842 00000009 00000000 f5d6b8f0 f8abefda
0
0000004
[    4.108256] Call Trace:
[    4.108266]  [<c1675822>] dump_stack+0x41/0x52
[    4.108273]  [<c1056804>] warn_slowpath_common+0x84/0xa0
[    4.108334]  [<f8abefda>] ? intel_panel_enable_backlight+0xca/0xd0 [i915]
...
[    4.109022]  [<c113f4ab>] ? vm_mmap_pgoff+0x8b/0xb0
[    4.109027]  [<c168854d>] sysenter_do_call+0x12/0x28
[    4.109029] ---[ end trace 457ad49306518c8d ]---
[    4.109031] ------------[ cut here ]------------
[    4.109067] WARNING: CPU: 0 PID: 204 at
/home/apw/COD/linux/drivers/gpu/drm/i915/intel_panel.c:342
intel_panel_compute_brightness+0x6a/0x70 [i915]()
[    4.109074] Modules linked in: hid_a4tech ahci(+) r8169 libahci i915(+)
usbhid mii i2c_algo_bit hid drm_kms_helper video drm
[    4.109077] CPU: 0 PID: 204 Comm: modprobe Tainted: G        W   
3.12.0-994-generic #201311210459
...
[    4.109932] WARNING: CPU: 0 PID: 204 at
/home/apw/COD/linux/drivers/gpu/drm/i915/intel_panel.c:450
i9xx_set_backlight+0xe4/0xf0 [i915]()
...
[    4.110815] WARNING: CPU: 0 PID: 204 at
/home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:9460
check_crtc_state+0x285/0x360 [i915]()
[    4.110816] pipe state doesn't match!

So I did not tested VGA/LVDS switching with this kernel

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