problem with monitor asus vw198s

[Dan Nicholson]

On Wed, Jan 7, 2009 at 12:31 PM, Fabio <fast at ferrara.linux.it> wrote:
>>> CPU: intel core2duo with 4 Gb of RAM
>>> MB: asus p5ql-em
>>> VGA: intel g43 (integrated on the MB)
>>> Monitor: asus vw198s
>>>
>>> I installed ubuntu 8.10 (amd64).
>>>
>>> The first problem is that the correct resolution of the monitor
>>> (1680x1050) is not recognized out of the box: after installation, it ran
>>> at a lower resolution (1360x768) and I was not able to change it.
>>> This surprised me.
>>> I couldn't find on the net a valid modeline for my monitor, so
>>> I followed the instructions on
>>>
>>> http://www.x.org/wiki/FAQVideoModes#head-82230a582646cbf28ac41dec2139732ee868e0d2
>>> to obtain a valid modeline using powerstrip.
>>> I got the following
>>>
>>> Modeline "1680x1050" 147.600 1680 1784 1968 2256 1050 1051 1054 1087
>>> -hsync +vsync
>>>
>>> Is this ok? It looks like, since I put it into /etc/X11/xorg.conf
>>> and, this way, the resolution is correct.
>>
>> I'm not sure if the bug is because of the intel driver or because of
>> the monitor. It would probably help to attach Xorg.0.log from the
>> failed attempt before you added the Modeline. It might also be
>> interesting to look at the output from "xrandr -q" which shows what
>> modes X thinks are available.
>>
>
> I restored the original xorg.conf. The relative Xorg.0.log is attached.
> As to "xrandr -q", the output is
>
> [coccobill 21:13:28 ~]$ xrandr -q
> Screen 0: minimum 320 x 200, current 1152 x 864, maximum 1360 x 1360
> VGA connected 1152x864+0+0 (normal left inverted right x axis y axis) 0mm x
> 0mm
>   1360x768       59.8
>   1152x864       60.0*
>   1024x768       60.0
>   800x600        60.3
>   640x480        59.9
> HDMI-1 disconnected (normal left inverted right x axis y axis)
> HDMI-2 disconnected (normal left inverted right x axis y axis)
> [coccobill 21:13:44 ~]$

Oh, one more thing. Even better would be a log with Option "ModeDebug"
"true" in the Device section.

>>> But now it comes another problem: sometime (not everytime) when I logout
>>> to change user instead of the usual gdm greeting I get that the monitor
>>> has no signal and goes automatically in poweroff: the only thing that I
>>> can do is an hard reboot of the pc.
>>> I can't understand the origin of this problem.
>>
>> There have been bugs with VT switching on intel recently. These are
>> being fixed, so it may be best here to file a bug with Ubuntu and wait
>> for the fixes to flow down.
>
> I made more googling in the afternoon and it seems that the issue is more
> with the framebuffer that with the intel driver.
> I had a try removing the fb, that is with options
> quiet nosplash video=vesa:off vga=normal
> for grub: apparently, the problem disappeared. At least, it didn't reproduce
> for at least 10 login/logout.
> (This is why I changed the subject)
>
> Of course I can live without the framebuffer and the splash screen, but
> I would prefer if there is a way to recover it ...  :-)

There will be another framebuffer built on top of DRM kernel
modesetting that works correctly with X, but it will probably be a
while until it appears.

--
Dan