Re: BUG: blank screen - unless keyboard/synaptic combo

From: Niel Lambrechts
Date: Fri May 22 2009 - 14:19:18 EST

(fixed top posting)

On 05/22/2009 05:39 AM, Zhang Rui wrote:
On Fri, 2009-05-22 at 06:58 +0800, Niel Lambrechts wrote:

Cc's added, attached lspci output.

On 05/19/2009 08:38 PM, Niel Lambrechts wrote:

I have a strange problem in that during a resume from hibernate my
text console (or X) remains blank - that is, until I simultaneously
press a keyboard key and touch the synaptic pad. It is not sufficient
to press just one or the other, it needs to be done simultaneously and
it resumes fine after doing this.

is this a regression or it exists on all the kernel you've tried?

Hi Zhang,

It is not a recent regression, all of the kernels I tried back to 2.6.28 shows the same problem. The test results I posted last night was with 2.6.30-rc6. I suspect it did not happen in 2.6.27, but I might be wrong since I could not bisect that far back (I am using EXT4 and have too many issues to bisect that far back).

please remote login the box after resume, and get the output of
"xrandr --verbose".


When I resume from suspend to RAM there is no problem.

When I resume from hibernate, my laptop actually remains unusable until I do the combination of things I mentioned. I cannot log in from remote or even ping the laptop, except if I first press the mentioned key combo. Before this, the display is either entirely blank or sometimes there is a white cursor in the top left corner.

The blank screen happens in runlevel 3 without X or "i915" loaded - I'm not sure but I suppose you want the "xrandr" output for another reason. It is interesting that it happens regardless of whether I am using Intel integrated graphics or Mobility Radeon HD 3650 (my laptop has both and I can enable one at a time). I boot the system with vga=791 and it is using vesafb for console.

I attached the output you asked for below after hibernating an Xorg session, but this is from just after pressing the combo as I could not log in over the network with the laptop in the blank state.

Thanks,
Niel


niella@linux-7vph:> xrandr --verbose
Screen 0: minimum 320 x 200, current 1600 x 1024, maximum 3840 x 1200
VGA disconnected 1600x1024+0+0 (0x3d) normal (normal left inverted right x axis y axis) 0mm x 0mm
Identifier: 0x3b
Timestamp: 184631
Subpixel: unknown
Clones:
CRTC: 0
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
1600x1024 (0x3d) 136.4MHz *current
h: width 1600 start 1704 end 1872 total 2144 skew 0 clock 63.6KHz
v: height 1024 start 1025 end 1028 total 1060 clock 60.0Hz
LVDS connected 1600x1024+0+0 (0x3d) normal (normal left inverted right x axis y axis) 331mm x 207mm
Identifier: 0x3c
Timestamp: 184631
Subpixel: horizontal rgb
Clones:
CRTC: 1
CRTCs: 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID_DATA:
00ffffffffffff0030ae554000000000
0011010380211578ea87f594574f8c27
27505400000001010101010101010101
0101010101018c41807a71b011403020
33004bcf100000197434802071b01440
302026004bcf100000190000000f00d1
0a32d10a281101004ca35532000000fe
004c544e31353455322d4c30350a0011
PANEL_FITTING: full_aspect
supported: center full_aspect full
BACKLIGHT_CONTROL: combination
supported: native legacy combination kernel
BACKLIGHT: 4722 (0x00001272) range: (0,4722)
1600x1024 (0x3d) 136.4MHz *current +preferred
h: width 1600 start 1704 end 1872 total 2144 skew 0 clock 63.6KHz
v: height 1024 start 1025 end 1028 total 1060 clock 60.0Hz
1920x1200 (0x3e) 167.8MHz -HSync -VSync +preferred
h: width 1920 start 1968 end 2000 total 2298 skew 0 clock 73.0KHz
v: height 1200 start 1203 end 1206 total 1217 clock 60.0Hz
1920x1200 (0x3f) 134.3MHz -HSync -VSync
h: width 1920 start 1968 end 2000 total 2208 skew 0 clock 60.8KHz
v: height 1200 start 1202 end 1208 total 1220 clock 49.8Hz
1600x1200 (0x40) 162.0MHz +HSync +VSync
h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.0KHz
v: height 1200 start 1201 end 1204 total 1250 clock 60.0Hz
1400x1050 (0x41) 122.0MHz +HSync +VSync
h: width 1400 start 1488 end 1640 total 1880 skew 0 clock 64.9KHz
v: height 1050 start 1052 end 1064 total 1082 clock 60.0Hz
1280x1024 (0x42) 108.0MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz
1280x960 (0x43) 108.0MHz +HSync +VSync
h: width 1280 start 1376 end 1488 total 1800 skew 0 clock 60.0KHz
v: height 960 start 961 end 964 total 1000 clock 60.0Hz
1024x768 (0x44) 65.0MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
v: height 768 start 771 end 777 total 806 clock 60.0Hz
800x600 (0x45) 40.0MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz
v: height 600 start 601 end 605 total 628 clock 60.3Hz
800x600 (0x46) 36.0MHz +HSync +VSync
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz
v: height 600 start 601 end 603 total 625 clock 56.2Hz
640x480 (0x47) 25.2MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz
v: height 480 start 490 end 492 total 525 clock 59.9Hz

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