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62 lines
1.9 KiB
Markdown
62 lines
1.9 KiB
Markdown
# Issue #63: system `btusb` ZLP test
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This test keeps the normal `aic_load_fw + btusb` architecture. It does not
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restore or install the vendor `aic_btusb` driver.
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The patch adds one quirk to the standard Linux `btusb` source:
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- match only AICSemi `368b:8d81`;
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- set `URB_ZERO_PACKET` on Bluetooth ACL bulk OUT transfers;
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- leave every other `btusb` device and code path unchanged.
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The test installer downloads the standard `btusb` source matching the running
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kernel's upstream version, applies the patch, and installs the resulting
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`btusb.ko` through DKMS. The distribution module is not overwritten and can be
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restored by removing the DKMS test package.
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## Install the test module
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On Fedora, make sure the test build dependencies are installed:
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```bash
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sudo dnf install dkms gcc make kernel-devel-$(uname -r) curl patch
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```
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Stop Bluetooth scanning and disconnect Bluetooth devices, then run:
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```bash
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cd tests/issue63-btusb-zlp
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sudo ./btusb-zlp-test.sh install
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./btusb-zlp-test.sh status
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```
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`modinfo -n btusb` should point to an `updates/dkms` path. Secure Boot systems
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may require the DKMS module to be signed or enrolled before it can load.
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Select AAC again and play audio for at least one hour:
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```bash
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bluetoothctl scan off
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pactl set-card-profile bluez_card.28_6F_40_46_AB_B1 a2dp-sink-aac
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```
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Please capture `sudo btmon -w issue63-zlp.btsnoop` and relevant `dmesg` lines if
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the connection still stalls.
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## Restore the distribution module
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```bash
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sudo ./btusb-zlp-test.sh remove
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./btusb-zlp-test.sh status
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```
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After removal, `modinfo -n btusb` should point back to the distribution's
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`kernel/drivers/bluetooth/btusb.ko` path.
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## Scope
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This is an A/B diagnostic patch, not a production workaround. If AAC remains
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stable, the small kernel patch can be submitted upstream. If it still fails,
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the next isolated experiment should add an AIC-specific runtime-PM quirk rather
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than replacing the standard Bluetooth driver.
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