Re: Upgrade Kernel, Lose External Display
On 2010-06-12 00:15 +0200, Gilbert Sullivan wrote:
> On 06/11/2010 03:08 PM, Sven Joachim wrote:
>> On 2010-06-11 19:06 +0200, Gilbert Sullivan wrote:
>>
>>> I undock from the port replicator and use the notebook's built-in
>>> 1920x1200 display, and the boot with the new kernel brings me to
>>> normal gdm login and then desktop. The only difference between
>>> appearance of boot using old kernel and new kernel is that, after the
>>> populating devices message, the text stops scrolling down the middle
>>> of the screen and starts scrolling down the left side. So I guess this
>>> is a video mode issue.
>>
>> I'm not sure I understand "middle of the screen" and "left side", but
>> the existing screen contents will be erased when nouveau is loaded.
>>
>
> This is a notebook, and I have the video set in BIOS to not "expand"
> to fill the screen. So it uses and area that's something like 800x600
> in the middle of the screen. It uses that small area for the scrolled
> messages at boot time all the way up until GDM is loaded -- that's
> when I'm using the old kernel -- with either the 1680x1050 DVI
> external LCD or the built-in 1920x1200 LCD.
Thanks, I understand now.
> When using the new kernel with the external LCD, it just goes black
> after the /dev populated message. With the built-in LCD that's the
> point where it stops using the 800x600 area and starts using the
> entire screen for the scrolled messages.
This is to be expected, because it detects and uses the display's native
resolution. This is usually what you want, but you can override it with
the video=800x600 boot parameter (or whatever other resolution you like).
> I booted the system connected to the port replicator and let it go to
> the black screen. I logged on to it via ssh and got the output of
> dmesg, which I'm attaching to this message as dmesg.txt.
Thanks. I don't see anything unusual in it, in particular nouveau
detects the 1680x1050 resolution of the external display:
> [ 7.308183] [drm] nouveau 0000:01:00.0: allocated 1680x1050 fb: 0x49000, bo f6feb600
> [ 7.319925] [drm] nouveau 0000:01:00.0: Output DVI-D-1 is running on CRTC 0 using output A
> [ 7.319929] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on tmds encoder (output 2)
> [ 7.319931] [drm] nouveau 0000:01:00.0: Output DVI-D-1 is running on CRTC 0 using output A
> [ 7.321231] Console: switching to colour frame buffer device 210x65
If you want to report a bug upstream, please see
http://nouveau.freedesktop.org/wiki/FrontPage#Bugs.
Cheers,
Sven
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