https://bugzilla.kernel.org/show_bug.cgi?id=212951
--- Comment #3 from Chris Chiu (chris.c...@canonical.com) --- I found a timing issue which might be worth investigation. The TBT WD dock I have here with the latest BIOS 0.5.57 can be manually waked up w/o AE_AML_LOOP_TIMEOUT problem. So I dump the acpi log and do cross-comparison between the WD19SC and WD19TB dock. A key resource and function in ssdt6.dsl are PowerResource (D3C) and \_SB.PC00.TCON (). The \_SB.PC00.D3C._ON and \_SB.PC00.TCON begins after the \_SB.PC00.PGON. Then during the period of TCON, the IPCS will run in parallel with TCON but the timing between TB and SC are different. Please refer to the TCON code in https://gist.github.com/mschiu77/05b9b8ff3ba795f11dd467660952f6e5#file-ssdt7-dsl-L884 In WD19SC case, the IPCS() will begin running before L911 (line 911 in the above link) per the ACPI log as follows. [ 262.733726] extrace-0138 ex_trace_point : Method Begin [0x0000000024236d48:\MCUI] execution. [ 262.733882] extrace-0138 ex_trace_point : Method Begin [0x000000003ff97c7a:\IPCS] execution. [ 262.744064] extrace-0138 ex_trace_point : Method Begin [0x000000004edb7213:\_SB.PC00.DSGS] execution. [ 262.744233] extrace-0138 ex_trace_point : Method End [0x000000004edb7213:\_SB.PC00.DSGS] execution. [ 262.744245] extrace-0138 ex_trace_point : Method Begin [0x0000000073d60801:\_SB.PC00.DSCR] execution. [ 262.744424] extrace-0138 ex_trace_point : Method Begin [0x000000004edb7213:\_SB.PC00.DSGS] execution. In WD19TB case, the IPCS will begin to run in parallel with L913 per the following ACPI log. [ 147.643528] extrace-0138 ex_trace_point : Method Begin [0x000000008fde276b:\MCUI] execution. [ 147.643927] extrace-0138 ex_trace_point : Method Begin [0x0000000006dad187:\_SB.PC00.DSGS] execution. [ 147.644164] extrace-0138 ex_trace_point : Method End [0x0000000006dad187:\_SB.PC00.DSGS] execution. [ 147.644175] extrace-0138 ex_trace_point : Method Begin [0x000000003af322ca:\_SB.PC00.DSCR] execution. [ 147.644338] extrace-0138 ex_trace_point : Method Begin [0x00000000dd5b6bc8:\IPCS] execution. [ 147.644788] extrace-0138 ex_trace_point : Method Begin [0x0000000006dad187:\_SB.PC00.DSGS] execution. [ 147.644927] extrace-0138 ex_trace_point : Method End [0x0000000006dad187:\_SB.PC00.DSGS] execution. [ 147.644949] extrace-0138 ex_trace_point : Method End [0x000000003af322ca:\_SB.PC00.DSCR] execution. >From the timestamp of WD19SC case, the IPCS starts 11ms ahead of L911, which may indicate the TCON is still in the while loop of L893. According to the debug message, the "TACK after D3 cold exit" is not printed which means TACK is not asserted yet. Is it possible that the IPCS also needs to wait for the TACK or the "ADBG ("D3Cold Exit")"? -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
