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Krzysztof kuhy Rudnicki
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
44 lines
1.7 KiB
JSON
44 lines
1.7 KiB
JSON
{
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"intent": "Logitech C270 stays at 30 fps in Google Meet (Helium) in low light instead of dropping to ~15 fps and looking laggy.",
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"scope": [
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"linux_configuration/fixes/fix_webcam_c270.sh",
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"linux_configuration/fixes/99-c270-fixed-framerate.rules",
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"linux_configuration/tests/test_fix_webcam_c270.bats",
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"Non-goal: manual exposure lock; auto exposure stays on"
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],
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"changes": [
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"udev rule sets exposure_dynamic_framerate=0 on the C270 capture node at every add event",
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"Installer script with install/--remove/--status; installs v4l-utils if missing"
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],
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"verification": [
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{
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"command": "v4l2-ctl -d /dev/video0 -c exposure_dynamic_framerate=0 (live, Meet open)",
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"result": "pass",
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"evidence": "User confirmed Meet video no longer laggy"
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},
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{
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"command": "vm run c270 'fix_webcam_c270.sh; --status; --remove; --status'",
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"result": "pass",
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"evidence": "Rule installed then removed in vmbox, rc=0"
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},
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{
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"command": "v4l2-ctl -c exposure_dynamic_framerate=1 && sudo udevadm trigger --action=add --settle /sys/class/video4linux/video0",
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"result": "pass",
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"evidence": "Host control read back exposure_dynamic_framerate: 0 after simulated plug-in"
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},
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{
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"command": "bats linux_configuration/tests/test_fix_webcam_c270.bats",
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"result": "pass",
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"evidence": "5/5 ok"
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}
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],
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"risks": [
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"Darker, noisier picture in dim rooms (fixed 33 ms max exposure)",
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"Chromium could start resetting this control in a future version, undoing the rule per stream"
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],
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"rollback": [
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"fix_webcam_c270.sh --remove, then replug the camera",
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"v4l2-ctl -d /dev/video0 -C exposure_dynamic_framerate reads the firmware value again"
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]
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}
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