Re: [Bugme-new] [Bug 8378] New: Averatec 3156X laptop doesn't reboot with kernels > 2.6.13.5 (responsible commit found)

[Segher Boessenkool <segher@kernel.crashing.org>]

That patch says

> +               outb(0x60, 0x64);       /* write Controller Command 
> Byte */
> +               udelay(50);
> +               kb_wait();
> +               udelay(50);
> +               outb(0x14, 0x60);       /* set "System flag" */

so the comment doesn't agree with the code: it sets
all flags in the command byte, not just the system
flag.  Perhaps importantly, it disables the keyboard
clock.  Why not do a read-modify-write sequence instead?
Something like

               outb(0x20, 0x64);       /* read Controller Command Byte 
*/
               udelay(50);
               kb_wait();
               udelay(50);
               u8 cmd = inb(0x60);
               udelay(50);
               kb_wait();
               udelay(50);
               outb(0x60, 0x64);       /* write Controller Command Byte 
*/
               udelay(50);
               kb_wait();
               udelay(50);
               outb(cmd | 0x04, 0x60); /* set "System flag" */

Segher

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