jcs.org
Control intel backlight on FreeBSD (and OpenBSD)
openbsd
README: add openbsd notes with kernel patch
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README
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README
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Originally ported to FreeBSD by "emmex" of the FreeBSD forums.
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Build:
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FreeBSD Build:
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pkg install libpciaccess libdrm
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make
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make install
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OpenBSD Build:
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make
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make install
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···
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Usage:
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./isl_backlight.sh &
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OpenBSD Notes:
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Requires a kernel capable of concurrent opening of /dev/xf86, if this is to be
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run while X is running. The following patch implements machdep.allowaperture=3
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to support this.
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Index: arch/amd64/amd64/mem.c
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===================================================================
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RCS file: /cvs/src/sys/arch/amd64/amd64/mem.c,v
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retrieving revision 1.23
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diff -u -p -u -p -r1.23 mem.c
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--- arch/amd64/amd64/mem.c 14 Mar 2015 03:38:46 -0000 1.23
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+++ arch/amd64/amd64/mem.c 26 May 2015 02:52:31 -0000
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@@ -93,8 +93,9 @@ mmopen(dev_t dev, int flag, int mode, st
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if (suser(p, 0) != 0 || !allowaperture)
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return (EPERM);
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- /* authorize only one simultaneous open() */
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- if (ap_open_count > 0)
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+ /* authorize only one simultaneous open() unless
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+ * allowaperture=3 */
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+ if (ap_open_count > 0 && allowaperture < 3)
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return(EPERM);
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ap_open_count++;
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break;
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@@ -213,6 +214,7 @@ mmmmap(dev_t dev, off_t off, int prot)
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else
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return -1;
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case 2:
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+ case 3:
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/* Allow mapping of the whole 1st megabyte
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for x86emu */
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if (off <= BIOS_END || !amd64_pa_used(off))