> Does not seems to be present in 4.5.5-1 which is the current (sid) > debian kernel. $ git show 28760c195e22856aedbacad5eb7b46ac1d76bb90 Author: Wolfram Sang <wsa@the-dreams.de> Date: Sat May 23 18:15:11 2015 +0200 ALSA: ppc: keywest: check if DEQ was already instantiated Due to changes in i2c-powermac, for some Macs the DEQ is instantiated now in i2c-powermac while some need the instantiation here in the keywest sound driver. The proper fix is to convert this driver to AOA. Until then support both ways of instantiation. Before this patch, some Macs lost sound because the sound driver failed when instantiating the DEQ for the second time. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Tested-by: Dan DeVoto <dand1972@yahoo.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> $ git describe 28760c195e22856aedbacad5eb7b46ac1d76bb90 v4.1-rc3-151-g28760c195e2285 So, this commit IS upstream since v4.2. If you don't have sound, this is probably due to another issue. Wolfram
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