Bug 803259

Did some further investigation. I found a workaround by booting to the commandline using nomodeset. Then I changed the grub boot paramters in Yast. In detail I set vga=0x366 as VGA mode. Rebooting does not show any bootsplash but I can see the text based boot process and logon to KDE.

By default the vga parameter was unspecified. By reverting to this setting the old error (blank screen) occurs.

Hmm. We no longer set vga parameter? So you added

  vga=0x366 mnomodeset

to end up in fbdev driver mode? Please attach your /var/log/Xorg.0.log.

No, to get a working console I (temporary) added nomodeset but then no X starts since the missing KMS stuff.

The real workaround is to add JUST vga=0x366 (no nomodeset). Little disadvantage is that I do not get any plymouth bootsplash but at least I can see something during boot time including my X session.

I'll add the Xorg log (from a "blank" boot without the vga parameter) later.

Created attachment 524572 [details]
Xorg logfile, X seems to start but after grub the screen gets (and remains) black

Weird. So it seems the initial KMS mode isn't working, but later the one, which is picked up by the X driver. Or it helps to initialize the mode with the generic 
framebuffer. So maybe only the monitor's native mode works. Could be verified by 
trying to configure different modes via xrandr.

Ok, I did a complete reinstallation. 

1.) Changed DVD Setup language to German - left the resolion unchanged to "default".
2.) The setup was in graphic mode without issues.
3.) The system restarted automatically and processed the automatic configuration before finishing the setup
4.) KDM startet and I was able to logon

After a restart the same error occured again - nothing to see after Grub. So I did the following:

1.) Set the user "juergen" to autologon
2.) Rebootet the system - I ensured KDE was startet but still nothing to see.
3.) I logged in via ssh from a remote machine and checked the settings via xrandr:

xrandr -display :0.0 -q
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 4096 x 4096
LVDS1 connected 1400x1050+0+0 (normal left inverted right x axis y axis) 305mm x 228mm
   1400x1050      60.0*+   60.0     50.0
   1280x1024      60.0
   1280x960       60.0
   1024x768       60.0
   800x600        60.3     56.2
   640x480        60.0     59.9
VGA1 disconnected (normal left inverted right x axis y axis)
DVI1 disconnected (normal left inverted right x axis y axis)

4.) Changed the resolution to other modes:

xrandr -display :0.0 -q --output LVDS1 --mode 1400x1050
xrandr -display :0.0 -q --output LVDS1 --mode 1280x1024
xrandr -display :0.0 -q --output LVDS1 --mode 1024x768
xrandr -display :0.0 -q --output LVDS1 --mode 800x600

I was able to see that the screen did something since the backlight seemed to be working - it went off and on again for a short time so I guess changing the resolution works.

5.) After setting the mode to 800x600 I checked it again

xrandr -display :0.0 -q
Screen 0: minimum 320 x 200, current 800 x 600, maximum 4096 x 4096
LVDS1 connected 800x600+0+0 (normal left inverted right x axis y axis) 305mm x 228mm
   1400x1050      60.0 +   60.0     50.0
   1280x1024      60.0
   1280x960       60.0
   1024x768       60.0
   800x600        60.3*    56.2
   640x480        60.0     59.9
VGA1 disconnected (normal left inverted right x axis y axis)
DVI1 disconnected (normal left inverted right x axis y axis)

Any ideas what to check next?

Forgot to mention - the error remained after changing the resolutions

Any info I can provide ?

I seem to have the same issue ;-(

This issue didn't exist with previous kernel versions. I can't be more specific about that, but it showed up just recently.

After booting everything works as usual, but at a certain point the screen goes black. Unfortunately this is where one is supposed to enter a password for an encrypted disk.

As far as I can tell visually, the blackness occurs at a time-label of about 3.5xxxx-ish (see boot.log)

After having entered the password and X starts up the screen is working again, including switching to text consoles.

Created attachment 542381 [details]
boot log - screen going blank at about 3.5xxx

Did a couple more boot tests.


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fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
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is the last line that shows up on the screen before it goes dark.

Product is no longer supported. In case the issue is still reproducable on a maintainerd product (at that momement: openSUSE 13.1 or later), feel free to reopen.