[BUG] 295.09 and 295.17 break X11 DPMS

[luceth]

Bug report: X11 DPMS breaks in both of the recent 295 series NVIDIA Linux x86_64 binary drivers.

Steps to reproduce:
- Run "xset force dpms off" in a terminal
- OR wait until the gnome-settings-daemon idle timer shuts off the display

What should happen:
- The screen blanks, then the backlight turns off. Moving the cursor or typing on the keyboard wakes the screen again.

What actually happens:
- The screen blanks, but the backlight does not turn off. Sometimes, moving the cursor or typing wakes brings back the desktop. Often, however, a terminal switch is required to rescue the desktop.

Hardware:
- Macbook Air 3,2. GeForce 320M chipset, LVDS panel LCD

Software:
- Ubuntu 11.10 (Oneiric), fully up-to-date plus -proposed but otherwise stock.

Other notes:
- The 290.10 driver works fine
- The screen shuts off as expected if one issues the command "sudo vbetool dpms off" - however, a mode switch is always required to restore the X desktop.
- I'm using the apple_bl kernel module and "RegistryDwords" "EnableBrightnessControl=1" to enable backlight brightness control using the keyboard hotkeys. Brightness control still works fine - including at brightness 0, at which the backlight is fully off.

Please find attached a bug report log.

[AaronP]

Thanks for reporting this. Does the problem go away if you add

Option "UseDPLib" "off"

to /etc/X11/xorg.conf?

[luceth]

Yes, adding that line to xorg.conf solves the problem.

Thanks!

[AaronP]

Thanks for testing that! I filed bug 938124.

[luceth]

Still broken with 295.20.

[oyvind]

Confirming this bug with 295.20, xserver 1.7.6 (Ubuntu Lucid x86-64), nvidia nvs 3100M, Dell E6510.

Backlight does not turn off when DPMS activates.

Option "UseDPLib" "off" causes screen to fail initialization (turns black with visible dark disturbances).

[oyvind]

Originally Posted by oyvind

Backlight does not turn off when DPMS activates.

Downgraded to 290.10 and now DPMS works fine.

[oyvind]

Aww.. Looks like this is still a problem in 295.33 ..

[oyvind]

Screen just blanks with:
$ xset dpms force off

(display backlight isn't turned off)

Some flickering occurs (where it looks like it turns completely off for a very short time) at first mouse/keyboard event, and then it's back on. No errors in logs. Option "UseDPLib" "off" causes black display (X server seems to start OK, but one cannot see much of it).

[oyvind]

Hi nvidia, is this bug (938124 in your tracker) fixed in the 295.40 release ?

[oyvind]

Originally Posted by oyvind

Hi nvidia, is this bug (938124 in your tracker) fixed in the 295.40 release ?

After a quick test, I am able to answer my own question. It's still broken in 295.40.

[oyvind]

Following up on the thread, this is still a problem in latest stable driver 295.49. Attaching updated bug report log.