diff options
| author | aszlig <aszlig@redmoonstudios.org> | 2016-08-10 00:27:02 +0200 |
|---|---|---|
| committer | aszlig <aszlig@redmoonstudios.org> | 2016-08-10 00:27:02 +0200 |
| commit | 235b37909b62f90b93c433338df6ab50ee65c886 (patch) | |
| tree | 50ed272d26a12b7d7d665ef2e658af9ba912f0f1 /modules | |
| parent | 979d733c078366919141204fb768c339ef8f3bd6 (diff) | |
hardware/t100ha: Fix vblank issue early at initrd
Using xset for DPMS control only works as soon as we have an X session, but we want to work around the issue as early as possible so let's set it in preDeviceCommands. The program here directly uses the ioctls to blank/unblank the current console without enums/constants (14 is blank and 4 is unblank) because it's just a workaround and supposed to go away in the near future. If we'd wanted to use the constants from tiocl.h, we'd have to add dependencies on Linux headers, but I'm lazy right now ;-) Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Diffstat (limited to 'modules')
| -rw-r--r-- | modules/hardware/t100ha/default.nix | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/modules/hardware/t100ha/default.nix b/modules/hardware/t100ha/default.nix index 303c56ab..87f5011d 100644 --- a/modules/hardware/t100ha/default.nix +++ b/modules/hardware/t100ha/default.nix @@ -114,9 +114,18 @@ in { # # I know this is very ugly, but another mitigation would be to disable power # management entirely, which I think is even uglier. - services.xserver.displayManager.sessionCommands = '' - ${pkgs.xorg.xset}/bin/xset dpms force standby - ${pkgs.xorg.xset}/bin/xset dpms force on + boot.initrd.preDeviceCommands = "fix-vblank"; + boot.initrd.extraUtilsCommands = '' + cc -Wall -o "$out/bin/fix-vblank" "${pkgs.writeText "fix-vblank.c" '' + #include <sys/ioctl.h> + + int main(void) { + char cmd = 14; + ioctl(0, TIOCLINUX, &cmd); + cmd = 4; + ioctl(0, TIOCLINUX, &cmd); + } + ''}" ''; }; } |