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moby: fix up CMA allocations so fractal (gui app) works

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this probably enables other apps like Element; untested
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colin
2022-10-04 02:25:59 -07:00
parent 5929286397
commit 5f277f8653
1 changed files with 6 additions and 0 deletions
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6
machines/moby/default.nix
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@@ -42,6 +42,12 @@
# the filtering/calibration is bad that it causes the screen to go fully dark at times. # the filtering/calibration is bad that it causes the screen to go fully dark at times.
boot.blacklistedKernelModules = [ "stk3310" ]; boot.blacklistedKernelModules = [ "stk3310" ];
# without this some GUI apps fail: `DRM_IOCTL_MODE_CREATE_DUMB failed: Cannot allocate memory`
# this is because they can't allocate enough video ram.
# the default CMA seems to be 32M. we could probably get by with as little as 64M, and safely with 128M.
# `cat /proc/meminfo` to see CmaTotal/CmaFree if interested in tuning this.
boot.kernelParams = [ "cma=256M" ];
# mobile-nixos' /lib/firmware includes: # mobile-nixos' /lib/firmware includes:
# rtl_bt (bluetooth) # rtl_bt (bluetooth)
# anx7688-fw.bin (USB-C -> HDMI bridge) # anx7688-fw.bin (USB-C -> HDMI bridge)