readme: document a couple of unsupported hdmi features (#30)

* readme: document lack of monitor swap support

* readme: document lack of hdmi cec support

README.md

@@ -31,3 +31,5 @@ sudo make install
 - screen save does not work properly
 - hdmi audio output does not work on some monitors
 - hdmi 1440p and 2160p video output does not work on some monitors
+- monitor swap is not supported
+- hdmi cec is not supported

linux.patch

@@ -106,6 +106,21 @@ index dafbf581c515..791687363cbf 100644
  	X86_NR_SUBARCHS,
  };
  
+diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
+index 31f01e9c7114..ec3c32893cca 100644
+--- a/arch/x86/kernel/cpu/amd.c
++++ b/arch/x86/kernel/cpu/amd.c
+@@ -1163,6 +1163,10 @@ static void init_amd(struct cpuinfo_x86 *c)
+ 	/* AMD CPUs don't need fencing after x2APIC/TSC_DEADLINE MSR writes. */
+ 	clear_cpu_cap(c, X86_FEATURE_APIC_MSRS_FENCE);
+ 
++	if (c->x86 == 0x17 && c->x86_model == 0x46)
++		strscpy(c->x86_model_id, "AMD Custom Zen 2 (Oberon)",
++			sizeof(c->x86_model_id));
++
+ 	/* Enable Translation Cache Extension */
+ 	if (cpu_has(c, X86_FEATURE_TCE))
+ 		msr_set_bit(MSR_EFER, _EFER_TCE);
 diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
 index fd28b53dbac5..569fc764d267 100644
 --- a/arch/x86/kernel/head64.c