On 07.07.2014 14:21, Joachim Backes wrote:
On 07/07/2014 01:06 PM, poma wrote:
On 07.07.2014 12:11, Joachim Backes wrote:
Problem description: replacing my ati video card (DVI) by a nvidia card
(DVI too) generates problems: almost unreadable (flickering) screen
during boot after some boot progress (even without rhgb), no gdm login
screen.
The primary F20 system was installed with the ati card.
Running "dracut --force" was no solution.
After investigating a little bit I saw that the grub boot-parameter
"video=1280x1024-24" was the culprit: replacing "video=1280x1024-24" by
"video=DVI-D:1280x1024-24".
Both the ati card and the nvidia card have a DVI connector.
So I can't explain this weird effect. Anybody has an explanation?
Kind regards
Joachim Backes
Was ist die ausgabe dieses befehls
ll /sys/class/drm/ (after running the NV card!)
total 0
lrwxrwxrwx 1 root root 0 Jul 7 14:16 card0 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
lrwxrwxrwx 1 root root 0 Jul 7 14:16 card0-DVI-I-1 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DVI-I-1
lrwxrwxrwx 1 root root 0 Jul 7 14:16 card0-HDMI-A-1 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-HDMI-A-1
lrwxrwxrwx 1 root root 0 Jul 7 14:16 card0-VGA-1 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-VGA-1
lrwxrwxrwx 1 root root 0 Jul 7 14:16 controlD64 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/controlD64
lrwxrwxrwx 1 root root 0 Jul 7 14:16 ttm ->
../../devices/virtual/drm/ttm
-r--r--r-- 1 root root 4096 Jul 7 14:16 version
BTW why are you using 'video=' directive?
Does no come from me! It's part of /etc/default/grub (my system was
installed using the very first F20 alpha, then updating).
Kind regards
Joachim Backes
Your problem was probably related to different video card capabilities or and due to different nomenclature of video connectors/outputs.
One example why 'video=' directive is used is to reduce the resolution and thereby increase the font displayed in a virtual terminal.
In your case it would be e.g. video=DVI-I-1:1280x1024-16@60
Although this can be done without it.
poma
Ref.
https://www.kernel.org/doc/Documentation/fb/modedb.txt
http://nouveau.freedesktop.org/wiki/KernelModeSetting/#forcingmodes
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